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Bug 765166 (CVE-2020-25657) - dev-python/m2crypto: Bleichenbacher vulnerability (CVE-2020-25657)
Summary: dev-python/m2crypto: Bleichenbacher vulnerability (CVE-2020-25657)
Status: CONFIRMED
Alias: CVE-2020-25657
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
URL: https://gitlab.com/m2crypto/m2crypto/...
Whiteboard: A4 [upstream]
Keywords:
Depends on:
Blocks:
 
Reported: 2021-01-12 22:20 UTC by Sam James
Modified: 2021-01-18 17:12 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Sam James archtester gentoo-dev Security 2021-01-12 22:20:50 UTC
CVE text:
"A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality."

The CVE references https://gitlab.com/m2crypto/m2crypto/-/issues/285 but that gets called a duplicate of a private bug. So, it's unclear if this has been fixed, but no recent commits seem relevant.
Comment 1 Sam James archtester gentoo-dev Security 2021-01-18 17:12:45 UTC
This needs to be fixed upstream in openssl, it seems:
https://github.com/openssl/openssl/issues/13421.

(See: https://gitlab.com/m2crypto/m2crypto/-/issues/285#note_486806844).